warn message

src/main.js

@@ -10,6 +10,8 @@ program
 if (!program.sharedFolder) {
   program.outputHelp()
   process.exit(1)
+} else {
+  console.log('\x1b[33m%s\x1b[0m', '[WARN] Any application that runs on your computer can potentially read from and write to all files in the directory.\n')
 }
 
 var router = new Router()